... ,steel structures, stair tread, well cover, trench cover, sump cover,compound gratings, storage shelves, ladder, fences and handrail so on for construction ... ,Powder coated or Hot dip Galvanizing5)Steel grating standards: A) China: YB/T4001-1998 B) USA: ANSI/NAAMM (MBG531-88) C) UK ... /60/50G505/60/50G555/60/50G605/60/50 325/30/100 steel grating (ISO9001:2000)